Dean McDermott 's celebrating a huge milestone in his sobriety journey ... revealing to fans he's been clean and sober for three years -- and encouraging others stuck in addiction to seek help. The actor shared a video on Instagram on Friday ... calling himself "Clean Dean" and saying he's in such a great mood because he's celebrating his third anniversary. Dean says he's sharing because he wants other people to know it is possible to get clean ... adding, "Hell has an exit." If Dean can do it,

Tag-uri: Instagram